I have a dumb question

Discussion in 'Reloading Forum (All Calibers)' started by Sniper338, Feb 9, 2019.

  1. Sniper338

    Sniper338

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    Comparator tool...

    Example we use it to measure OAL off the oj with a bullet seated.

    When measuring case shoulder bump, do yall use a bigger caliber comperator, say a 30 cal to measure the shoulder on a cartridge with a 6mm neck? So it goes over the neck?

    Or what tool is used best for measuring shoulder bump
     
  2. nso123

    nso123 Silver $$ Contributor

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  3. ED3

    ED3 Gold $$ Contributor

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    https://www.sinclairintl.com/reload...ools/sinclair-bump-gage-insert-prod35265.aspx
     
  4. Sniper338

    Sniper338

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  5. chromatica

    chromatica

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  6. SPJ

    SPJ Silver $$ Contributor

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    As BCz suggested a 45acp shell does the same thing free just use the same one, now you measuring the .450 datum
     
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  7. Sniper338

    Sniper338

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    Always something to learn, even when its a basic thing lol
     
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  8. alf

    alf Silver $$ Contributor

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    [​IMG]
     
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  9. ED3

    ED3 Gold $$ Contributor

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    Can't speak to the Redding. Mine are Sinclair.
    It has a 0.25" insert depth, drops into a 0.50" bore.
    The critical dimensions:
     

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    Last edited: Feb 10, 2019
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  10. JMayo

    JMayo

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  11. Sniper338

    Sniper338

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    Fabulous, Ill have to measure.
     
  12. hrlincoln

    hrlincoln Silver $$ Contributor

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    Not familiar with Redding comparator holders for calipers, and I didn't see anything on their website...got a Redding part#? One of my Hornadys keeps coming loose.
     
  13. P1ZombieKiller

    P1ZombieKiller Gold $$ Contributor

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    Some people call this a gizmo (or gizzy)
     
    Last edited: Feb 11, 2019
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  14. Sniper338

    Sniper338

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    Hell it could be sinclair I have. They are green holders.
     
  15. SPJ

    SPJ Silver $$ Contributor

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    This appears to be a neck bushing from a larger caliber " I'm sure it works just fine
     
  16. alf

    alf Silver $$ Contributor

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    Wrong......it's a barrel stub with the finish reamer run partially in......
     
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  17. SPJ

    SPJ Silver $$ Contributor

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    That's awesome "
    Bet it works great.
    Is that refered to as a Gizzy?
     
    Last edited: Feb 11, 2019
  18. dkhunt14

    dkhunt14

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    The green ones I saw were Sinclair. Matt
     
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  19. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    Functions the same but more steady. The gizzy is brass, only passes the case mouth a few thou and the dia is about the same as the case itself. Very easy to lose
     
  20. Falfan2017

    Falfan2017 Gold $$ Contributor

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    Piece of 9mm brass or 40 sw upside down works pretty well on the cheap. Also if you buy a die from harrels they send you a nice bump measure tool as well.
     

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